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I have a 98 gsr and I just put a plm 4-1 header and Megan test pipe.....now it sounds like a wrx! why would it sound like that?

What's up guys! To start I have a 98 gsr. The problem is when the car idles I has a very low sputtering sound! And when I'm goin in gear and let off the gas...it backfired and sputters when it passes 3k! it has no codes What could it be?

Im wanting to boost my stock gsr. My goal for this motor is make 350 hp but wouldnt mind a little more. I have been reading around at different forums and they say that the stock internals should hold up to about 300 to 350 (correct me if im wrong) but I dont want to risk blowingit. My budget...

Im wanting to boost my stock gsr. My goal for this motor is make 350 hp but wouldnt mind a little more. I have been reading around at different forums and they say that the stock internals should hold up to about 300 to 350 (correct me if im wrong) but I dont want to risk blowingit. My budget...

Hey guys Im having a problem with my intake air temp sensor on my gsr . I recently pulled th he motor but when we hooked up the harness ima gettin cel and code p0113. What could it be?